diff --git a/Resources/config/services.yml b/Resources/config/services.yml
index 887d78e..fca2c44 100755
--- a/Resources/config/services.yml
+++ b/Resources/config/services.yml
@@ -7,7 +7,8 @@ parameters:
     
 services:
     captcha.type:
-        class: '%gregwar_captcha.captcha_type.class%' 
+        class: '%gregwar_captcha.captcha_type.class%'
+        public: true
         arguments:
             - '@session'
             - '@gregwar_captcha.generator'
@@ -18,6 +19,7 @@ services:
 
     gregwar_captcha.generator:
         class: '%gregwar_captcha.captcha_generator.class%'
+        public: true
         arguments:
             - '@router'
             - '@gregwar_captcha.captcha_builder'
@@ -26,6 +28,7 @@ services:
 
     gregwar_captcha.image_file_handler:
         class: '%gregwar_captcha.image_file_handler.class%'
+        public: true
         arguments:
             - '%gregwar_captcha.config.image_folder%'
             - '%gregwar_captcha.config.web_path%'
@@ -34,6 +37,8 @@ services:
 
     gregwar_captcha.captcha_builder:
         class: '%gregwar_captcha.captcha_builder.class%'
+        public: true
 
     gregwar_captcha.phrase_builder:
         class: '%gregwar_captcha.phrase_builder.class%'
+        public: true
diff --git a/composer.json b/composer.json
index 4272401..ff8d0d4 100644
--- a/composer.json
+++ b/composer.json
@@ -19,8 +19,8 @@
     "require": {
         "php": ">=5.3.9",
         "gregwar/captcha": "~1.1",
-        "symfony/framework-bundle": "~2.8|~3.0",
-        "symfony/form": "~2.8|~3.0"
+        "symfony/framework-bundle": "~2.8|~3.0|~4.0",
+        "symfony/form": "~2.8|~3.0|~4.0"
     },
     "autoload": {
         "psr-4": {